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Animate and resize container to dynamic height

Does anyone know how to animate the resizing of a container when the target height is auto?
This is what I use to animate the resize of a container currently, it does resize, but it does not animate. I think it's because it cannot animate when height is auto, as it does animate when height is fixed (such as height: '700px').
.pagecontainer is the overall container, inside it are a bunch of pages (#page1 #page2 #page3 etc), which are the actual content. I'm trying to get .pagecontainer's height to resize.